- Variety (US)"Mary Duncan Sanford, 98, former actress, died May 9 in Palm Beach"June 7, 1993 · pg. 57:2
- New York Sun (US)"Mary Duncan Talks of Her New Contract-Three FilmsOpening Today."August 31, 1933 · Vol. 100, Iss. 307, pg. 10 · by: Eileen Creelman
- Photoplay (US)"Saved from the Law"June 1928 · Vol. XXXIV, Iss. 1, pg. 63, 96 · by: Erle Hampton
- Moving Picture World (US)"W.R. Sheehan Signs Mary Duncan; Talented Stage Star in Fox Films"May 2, 1927 · pg. 832
- Lui (FR)"Service après vamp"June 1966 · Iss. 30, pg. 135 · by: Michel Caen
- The New Movie Magazine (US)"Mary Duncan"November 1930 · Vol. 2, Iss. 5, pg. 82
- The New Movie Magazine (US)"Mary Duncan"February 1930 · Vol. 1, Iss. 3, pg. 102
- Cine-Mundial (US)December 1928 · Vol. XIII, Iss. 12
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